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In-medium nucleon-nucleon elastic cross sections determined fromnucleon-induced reaction cross sections data
Li Ou, Xue-ying He
Published:   , doi: 10.1088/1674-1137/43/4/044103
Abstract:
Within the framework of the improved quantum molecular dynamics model, the medium modifications on the free nucleon-nucleon elastic cross sections are investigated. By using various in-medium nucleon-nucleon elastic cross sections in the model, the nucleon-induced reactions on various targets are simulated, and the excitation functions of reaction cross sections in the energy range from 25 MeV to 1 GeV are calculated. By comparing the calculations with the experimental data, an isospin, density, and momentum-dependence medium correction factor on free nucleon-nucleon elastic cross sections is determined.
Proton emission from the drip-line nuclei I-Bi using WKB approximation with relativistic mean field densities
T. Sahoo, R. N. Panda, S. K. Patra
Published:   , doi: 10.1088/1674-1137/43/4/044102
Abstract:
We studied the properties of proton rich nuclei reported as proton emitters in the region from I to Bi with Z = 53 to 83 and N = 56 to 102 as a crucial application to the existence of exotic nuclei. The effective-field-theory-motivated relativistic mean-field formalism (E-RMF) with NL3, FSUGarnet, G3 and IOPB-I interactions is adopted to analyze the ground state properties of the proton emitters. Furthermore in the E-RMF background, the Wentzel-Karmers-Brillouin (WKB) barrier penetration method is used for the calculation of proton emission half-lives. It is found that the calculated half-lives are in good agreement with the experimental results for all the emitters considered in this study.
Constraining anomalous Higgs boson coupling in H+ $ \gamma $ production
Liaoshan Shi, Zhijun Liang, Bo Liu, Zhenhui He
Published:   , doi: 10.1088/1674-1137/43/4/043001
Abstract:
Higgs boson production in association with a photon (H+ \begin{document}$ \gamma $\end{document} ) offers a promising channel to test the Higgs boson to photon coupling at various energy scales. Its potential sensitivity to anomalous couplings of the Higgs boson has not been explored with proton-proton collision data. In this paper, we reinterpret the latest ATLAS H+ \begin{document}$ \gamma $\end{document} resonance search results within the Standard Model effective field theory (EFT) framework, using 36.1 fb−1 of proton-proton collision data recorded with the ATLAS detector at \begin{document}$ \sqrt{s}=13 $\end{document} TeV. Constraints on Wilson coefficients of dimension-six EFT operators related to the Higgs boson to photon coupling are provided for the first time in H+ \begin{document}$ \gamma $\end{document} final state at the LHC.
Basic characteristics for the nuclear landscape via an improved Weizsäcker-Skyrme-Type nuclear mass model
Na-Na MA, Hai-Fei ZHANG, Xiao-Jun BAO, Hong-Fei ZHANG
Published:   , doi: 10.1088/1674-1137/43/4/045101
Abstract:
Atomic Mass Evaluation (AME2016) has replenished the latest data of nuclear binding energy. Other physical observable, such as the separated energies, decay energies and the pairing gaps, were evaluated based on the new mass table. An improved Weizsäcker-Skyrme-type (WS-Type) nuclear mass model with only 13 parameters was presented, including the correction from two combinatorial radial basis functions (RBFs). Where shell and pairing effects are simultaneously dealt with a Strutinsky-like method. 2267 updated experimental binding energies as inputs in RBFs code and their correspondent root-mean square (rms) deviations dropped to 149 keV. For other mass models training by RBFs correction, rms deviations are clustered between 100 to 200 keV. Compared with other experimental quantities, the rms deviations calculated within the improved WS-Type model falls between 100 and 250 keV. We extrapolate the binding energies to 12435 nuclei which covers the range \begin{document}$ 8\leqslant Z\leqslant128 $\end{document} and \begin{document}$ 8\leqslant N\leqslant251 $\end{document} , in the framework of WS-Type model with RBFs correction. Simultaneously the ground state deformations \begin{document}$ \beta_{2, \; 4, \; 6} $\end{document} and all the parts in WS-Type mass formula are shown in this paper. Finally, we tabulated all calculated characteristics within improved formula and linked to https://github.com/lukeronger/NuclearData-LZU: nuclear binding energies, one-nucleon and two-nucleon separation energies ( \begin{document}$ S_{\rm{n, \; p, \; 2n, \; 2p}} $\end{document} ), \begin{document}$ \alpha $\end{document} and \begin{document}$ \beta $\end{document} -decay energies ( \begin{document}$ Q_{\alpha} $\end{document} and \begin{document}$ Q_{\rm{\beta^-, \; \beta^+, \; EC}} $\end{document} ) as well as pairing gap \begin{document}$ \Delta_{\rm{n}} $\end{document} and \begin{document}$ \Delta_{\rm{p}} $\end{document} .
Dark matter, neutrino mass, cutoff for cosmic-ray neutrino, and Higgs boson invisible decay from a neutrino portal interaction
Wen Yin
Published:   , doi: 10.1088/1674-1137/43/4/045101
Abstract:
We study an effective theory beyond the standard model (SM) where either of two additional gauge singlets, a Majorana fermion and a real scalar, constitutes all or some fraction of dark matter. In particular, we focus on the masses of the two singlets in the range of \begin{document}$ \cal{O} $\end{document} (10) MeV- \begin{document}$ \cal{O} $\end{document} (10) MeV, with a neutrino portal interaction which plays important roles not only in particle physics but also in cosmology and astronomy. We point out that the dark matter abundance can be thermally explained with (co)annihilation, where the dark matter with a mass greater than 2 GeV can be tested in future lepton colliders, CEPC, ILC, FCC-ee and CLIC, in the light of the Higgs boson invisible decay. When the gauge singlets are lighter than \begin{document}$ \cal{O} $\end{document} (100) MeV, the interaction can affect the neutrino propagation in the universe due to its annihilation with the cosmic background neutrino into the gauge singlets. Although can not be the dominant dark matter in this case, the singlets are produced by the invisible decay of the Higgs boson at a rate fully within the reach of the future lepton colliders. In particular, a high energy cutoff of cosmic-ray neutrino, which may account for the non-detection of Greisen-Zatsepin-Kuzmin (GZK) neutrinos or non-observation of Glashow resonance, can be set. Interestingly, given the cutoff and the mass (range) of the WIMP, a neutrino mass can be " measured” kinematically.
Probing cold nuclear matter effects with the productions of isolated- ${\gamma} $ and ${\gamma} $ +jet in p+Pb collisions at ${\sqrt{{s}_{{NN}}}}= $ 8.16 TeV
Guo-Yang Ma, Wei Dai, Ben-Wei Zhang
Published:   , doi: 10.1088/1674-1137/43/4/044104
Abstract:
We investigate the cold nuclear matter (CNM) effects on the productions of the isolated prompt photon and \begin{document}$ \gamma+ $\end{document} jet in proton-lead collisions at \begin{document}$ \rm 8.16 $\end{document} TeV under the next-to-leading order (NLO) perturbative quantum chromodynamics calculations with four parametrizations for nuclear parton distribution functions (nPDFs), i.e. DSSZ, EPPS16, nCTEQ15, nIMParton. Our theoretical calculations provide good descriptions of pp baseline in the ATLAS collaboration and make predictions for future experimental results at \begin{document}$ \rm p $\end{document} + \begin{document}$ \rm Pb $\end{document} collisions. We calculate the dependence of the nuclear modification factor of isolated prompt photon on transverse momentum \begin{document}$ p_{\rm T}^{\gamma} $\end{document} and pseudo-rapidity \begin{document}$ \eta^{\gamma} $\end{document} at very forward and backward rapidity regions, and demonstrate that the forward-to-backward yield asymmetries \begin{document}$ Y_{\rm pPb}^{\rm asym} $\end{document} as a function of \begin{document}$ p_{\rm T}^{\gamma} $\end{document} with different nPDFs parametrizations have diverse behaviors. Furthermore, the nuclear modification factor of isolated- \begin{document}$ \gamma+ $\end{document} jet \begin{document}$ R_{\rm pPb}^{\gamma\rm Jet} $\end{document} as a function of \begin{document}$ \gamma+ $\end{document} jet's pseudo-rapidity \begin{document}$ \eta_{\gamma \rm Jet}=\displaystyle\frac{1}{2}(\eta_{\gamma}+\eta_{\rm Jet}) $\end{document} at different average transverse momentum \begin{document}$ p_{\rm T}^{\rm avg}=\displaystyle\frac{1}{2}(p_{\rm T}^{\gamma}+ p_{\rm T}^{\rm Jet}) $\end{document} has been discussed, which can facilitate a tomography study of CNM effects with precise locations in a rather wide kinematic region by varying the transverse momenta and rapidities of both isolated photon and jet in p+A collisions.
Global constraints from RHIC and LHC on the transport properties of QCD fluids in the CUJET/CIBJET framework
Shuzhe Shi, Jinfeng Liao, Miklos Gyulassy
Published:   , doi: 10.1088/1674-1137/43/4/044101
Abstract:
We report results of a comprehensive global \begin{document}$ \chi^2 $\end{document} analysis of nuclear collision data from RHIC (0.2 ATeV), LHC1 (2.76 ATeV), and recent LHC2 (5.02 ATeV) energies using the updated CUJET framework. The framework combines consistently viscous hydrodynamic fields predicted by VISHNU2+1 (validated with soft \begin{document}$ p_T<2 $\end{document} GeV bulk observables) and the DGLV theory of jet elastic and inelastic energy loss generalized to QGP fluids with an sQGMP color structure including effective semi-QGP color electric quark and gluon as well as emergent color magnetic monopole degrees of freedom constrained by lattice QCD data. We vary the two control parameters of the model (the maximum value of the running QCD coupling, \begin{document}$ \alpha_c $\end{document} , and the ratio \begin{document}$ c_m $\end{document} of color magnetic to electric screening scales) and calculate the global \begin{document}$ \chi^2(\alpha_c,c_m) $\end{document} compared to available jet fragment observables ( \begin{document}$ R_{{\rm AA}}, v_2 $\end{document} ). A global \begin{document}$ \chi^2<2 $\end{document} minimum is found with \begin{document}$ \alpha_c \approx 0.9\pm 0.1 $\end{document} , and \begin{document}$ c_m\approx 0.25\pm 0.03 $\end{document} . Using CIBJET, the event-by-event (ebe) generalization of the CUJET framework, we show that ebe fluctuations of the initial conditions do not alter significantly our conclusions (except for \begin{document}$ v_3 $\end{document} ). An important theoretical advantage of the CUJET and CIBJET frameworks, is not only its global \begin{document}$ \chi^2 $\end{document} consistency with jet fragment observables at RHIC and LHC and with non-perturbative lattice QCD data, but also its internal consistency of the constrained jet transport coefficient, \begin{document}$ \hat{q}(E,T)/T^3 $\end{document} with the near perfect fluid viscosity to entropy ratio ( \begin{document}$ \eta/s \sim T^3/\hat{q}\sim 0.1-0.2 $\end{document} ) property of QCD fluids near \begin{document}$ T_c $\end{document} needed to account for the low \begin{document}$ p_T<2 $\end{document} GeV flow observables. Predictions for future tests at LHC with 5.44 ATeV Xe+Xe and 5.02 ATeV Pb+Pb are also presented.
The LFV decays of Z boson in Minimal R-symmetric Supersymmetric Standard Model
Ke-Sheng Sun, Jian-Bin Chen, Xiu-Yi Yang, Sheng-Kai Cui
Published:   , doi: 10.1088/1674-1137/43/4/043101
Abstract:
A future Z-factory will offer the possibility to study rare Z decays \begin{document}$ Z\rightarrow l_1l_2 $\end{document} , as those leading to Lepton Flavor Violation final states. In this work, by taking account of the constraints from radiative two body decays \begin{document}$ l_2\rightarrow l_1\gamma $\end{document} , we investigate the Lepton Flavor Violation decays \begin{document}$ Z\rightarrow l_1l_2 $\end{document} in the framework of Minimal R-symmetric Supersymmetric Standard Model with two benchmark points from already existing literatures. The flavor violating off-diagonal entries \begin{document}$ \delta^{12} $\end{document} , \begin{document}$ \delta^{13} $\end{document} and \begin{document}$ \delta^{23} $\end{document} are constrained by the current experimental bounds of \begin{document}$ l_2\rightarrow l_1\gamma $\end{document} . Considering recent experimental constraints, we also investigate Br( \begin{document}$ Z\rightarrow l_1l_2 $\end{document} ) as a function of \begin{document}$ M_D^W $\end{document} . The numerical results show that the theoretical prediction of Br( \begin{document}$ Z\rightarrow l_1l_2 $\end{document} ) in MRSSM are several orders of magnitude below the current experimental bounds. The Lepton Flavor Violation decays \begin{document}$ Z\rightarrow e\tau $\end{document} and \begin{document}$ Z\rightarrow \mu\tau $\end{document} may be promising to be observed in future experiment.
Probing the QCD phase structure with higher order baryon number susceptibilities within the NJL model
Wenkai Fan, Xiaofeng Luo, Hongshi Zong
Published:   , doi: 10.1088/1674-1137/43/3/033103
Abstract:
Conserved charge fluctuations can be used to probe the phase structure of the strongly interacting nuclear matter in relativistic heavy-ion collisions. To obtain the characteristic signatures of the conserved charge fluctuations for the QCD phase transition, we perform a detailed study on the susceptibilities of dense quark matter up to 8th order by using an effective QCD based model. We studied two cases, one with the QCD critical end point (CEP) and one without due to an additional vector interaction term. The higher order susceptibilities display rich structures near the CEP and show sign changes as well as large fluctuations. These can provide us information about the presence and location of the CEP. Furthermore, we find that the case without the CEP also show similar sign change pattern, but with relatively smaller magnitude comparing to the case with the CEP. Finally, we conclude that higher order susceptibilities of conserved charge can be used to probe the QCD phase structures in heavy-ion collisions.